A method and system for obtaining stator current value of a permanent magnet synchronous motor

Abstract

This invention provides a method for obtaining the stator current value of a permanent magnet synchronous motor, comprising the following steps: S1, establishing a mathematical model in simulation software, simulating the parameters of the motor under test to obtain the id iq instruction table; S2, collecting the current three-phase current, rotor angle, and electromagnetic torque of the motor under test; S3, obtaining the values ​​after Clark and Park transformations of the values, and feeding them back to the comparator; S4, the id iq instruction table sends a set of instructions to generate three-phase current through a PI current regulator, Park inverse transformation, SVPWM module, and inverter, collecting the current, rotor angle, and electromagnetic torque data of the motor under test, repeating the adjustment until stable, and then the id iq instruction table sends the next set of instructions; S5, repeating step S4 until the id iq instruction table has sent all instructions, and using the collected data as the basic training data for constructing the mathematical model; S6, the mathematical model calculates the optimal torque-speed-current relationship table. This invention provides a simple and accurate method for obtaining data, applicable to different motors.

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